How fast is a ball going when it hits the ground after being dropped from a

height of 13 m? The acceleration of gravity is 9.8 m/s2.

A. 14.2 m/s

B. 10.5 m/s

C. 8.7 m/s

D. 16.0 m/s

State both the sign and the magnitude of the charge on a proton, electron, and a neutron in terms of e, the elementary charge.

What properties of titanium make it attractive for use in race-car and jet-engine components?

A good baseball pitcher can throw a baseball toward home plate at 87 mi/h with a spin of 1710 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume that the 60 ft path is a straight line.

Which of these is the best exclamation for why to negatively charged balloons, if put close, will repel? A. Charged objects sin little lightning bolts of electrons across the space between the two balloons B.

A 0.023 kg beetle is sitting on a record player 0.15 m from the center of the record. If it takes 0.070 N of force to keep the beetle moving in a circle on the record, what is the tangential speed of the beetle?

Double the resistance of the resistor by changing it from 10 Ω to 20 Ω. What happens to the current flowing through the circuit?

Who would most likely be required to work with sodium hydroxide? A: a plumber B: a gardener C: a bricklayer D: a mechanic

A roller coaster is entering a vertical loop which has a radius of 25.0 m. If the coaster is traveling at 45.0 m/s as it enters the loop, how much is the centripetal force that you experience? (Assume your mass to be 75.

Which best describes tropical continental climate during the summer? A. clear, dry weather, B. cloudy, wet weather, C. cold, dry weather, D. hot, dry weather

At the beach, describe where or when you would see wave fronts. How are wave fronts useful to surfers?